Based on the famous Fortune Quest RPG world, Duan Sark tells of an ambitious but struggling 16-year-old level-2 fighter who travels with an old short sword and a curious little flying lizard named Check. In "Black Knights of the Silver-Gray Castle," the three adventurous fighters - Duan, Olba, and Agnis - are on a quest through a magical forest to find a friend, Agnisa, only to be captured by the Black Knights and accused of a crime they did not commit!